#!/bin/sh
# Modified version of Luke Smith's network usage script

# Print cache so it doesn't get stuck in dwmblocks
cat "$XDG_CACHE_HOME"/netstat

# Store transferred and recieved bytes
rstart="$(($(cat /sys/class/net/[ew]*/statistics/rx_bytes | paste -sd '+')))"
tstart="$(($(cat /sys/class/net/[ew]*/statistics/tx_bytes | paste -sd '+')))"
sleep 1
rend="$(($(cat /sys/class/net/[ew]*/statistics/rx_bytes | paste -sd '+')))"
tend="$(($(cat /sys/class/net/[ew]*/statistics/tx_bytes | paste -sd '+')))"

# Format correctly and print
dow=$(printf "%2sB\n" "$(numfmt --to=iec $(($rend-$rstart)))" | sed 's/ //g')
up=$(printf "%2sB\n" "$(numfmt --to=iec $(($tend-$tstart)))" | sed 's/ //g')
printf "%2s" "$dow|$up" > "$XDG_CACHE_HOME"/netstat